Degassing system, method for degassing liquids, degassing unit, degassing module, and degassing-system manufacturing method and method of production from natural resources

Abstract

A degasification system includes a plurality of degasification units which degasifies a liquid and a cylindrical housing which houses the plurality of degasification units in parallel. Each of the plurality of degasification units includes a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled in a cylindrical shape and a cylinder in which the hollow fiber membrane bundle is housed. The housing has an inlet, an outlet, and a sealing portion which partitions an internal space of the housing into an upstream side region on the inlet side and a downstream side region on the outlet side via the plurality of degasification units. The plurality of degasification units are configured such that pressure losses of the liquid differ depending on a distance from a central axis of the housing.

1 . A degasification system comprising:
 a plurality of degasification units configured to degasify a liquid; and   a cylindrical housing configured to house the plurality of degasification units in parallel,   wherein each of the plurality of degasification units includes a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled in a cylindrical shape and a cylinder in which the hollow fiber membrane bundle is housed,   wherein the housing has an inlet through which the liquid is supplied from outside, an outlet through which the liquid is discharged to the outside, and a sealing portion which partitions an internal space of the housing into an upstream side region on the inlet side and a downstream side region on the outlet side via the plurality of degasification units, and   wherein the plurality of degasification units are configured such that pressure losses of the liquid differ depending on a distance from a central axis of the housing.   
     
     
         2 . The degasification system according to  claim 1 , further comprising: a suction pipe communicating with an inside of the hollow fiber membranes and penetrating the housing to suction the inside of the hollow fiber membranes. 
     
     
         3 . The degasification system according to  claim 1 , wherein, among the plurality of degasification units, the degasification unit that overlaps the inlet when seen in a direction along the central axis is configured such that the pressure loss of the liquid therein is larger than that in the degasification unit that does not overlap the inlet when seen in a direction along the central axis. 
     
     
         4 . The degasification system according to  claim 1 ,
 wherein, in a case in which a region from an inner peripheral surface of the housing to a position corresponding to 0.7 times an outer diameter of the degasification unit toward the central axis side is defined as an outer region and a region inside the outer region is defined as an inner region,   in the inner region, the plurality of degasification units have an inner degasification unit and an outer degasification unit which is farther from the central axis than the inner degasification unit, and   the inner degasification unit is configured such that the pressure loss of the liquid therein is larger than that in the outer degasification unit.   
     
     
         5 . The degasification system according to  claim 1 ,
 wherein, in a case in which a region from an inner peripheral surface of the housing to a position corresponding to 0.7 times an outer diameter of the degasification unit toward the central axis side is defined as an outer region, a region inside the outer region is defined as an inner region, and all the degasification units are disposed in the inner region,   the plurality of degasification units are configured such that the pressure loss of the liquid increases as the degasification unit becomes closer to the central axis.   
     
     
         6 . The degasification system according to  claim 1 ,
 wherein, in a case in which a region from an inner peripheral surface of the housing to a position corresponding to 0.7 times an outer diameter of the degasification unit toward the central axis side is defined as an outer region, a region inside the outer region is defined as an inner region, at least one degasification unit is disposed in the outer region, and remaining degasification units are disposed in the inner region,   the degasification units disposed in the inner region are configured such that the pressure loss of the liquid increases as the degasification unit becomes closer to the central axis.   
     
     
         7 . The degasification system according to  claim 6 , wherein the degasification unit disposed in the outer region is configured such that the pressure loss of the liquid therein is larger than that in the degasification unit closest to the outer region among the degasification units disposed in the inner region. 
     
     
         8 . The degasification system according to  claim 1 ,
 wherein, in the degasification unit, a plurality of degasification modules are connected,   wherein each of the plurality of the degasification modules includes a hollow fiber membrane bundle having a plurality of hollow fiber membranes arranged around a liquid supply path through which a liquid is supplied and a cylinder which houses the hollow fiber membrane bundle and in which discharge ports for discharging the liquid are formed, and   wherein the degasification unit has a connection supply pipe which connects the liquid supply paths of the plurality of degasification modules in series and in which openings through which the liquid passes are formed at positions corresponding to the plurality of degasification modules such that the liquid is supplied to the hollow fiber membrane bundles of the plurality of degasification modules in parallel.   
     
     
         9 . A liquid degasification method in the degasification system according to  claim 1 , comprising:
 degasifying a liquid by supplying the liquid from the inlet to the plurality of degasification units and depressurizing an inside of the plurality of hollow fiber membranes of each of the plurality of degasification units.   
     
     
         10 . A degasification unit used in the degasification system according to  claim 1 , comprising:
 a hollow fiber membrane bundle in which a plurality of hollow fiber membranes are bundled in a cylindrical shape; and   a cylinder in which the hollow fiber membrane bundle is housed.   
     
     
         11 . A degasification module used in the degasification system according to  claim 8 , comprising:
 a hollow fiber membrane bundle having a plurality of hollow fiber membranes arranged around a liquid supply path through which a liquid is supplied; and   a cylinder which houses the hollow fiber membrane bundle and in which discharge ports for discharging the liquid are formed.   
     
     
         12 . A method for manufacturing a degasification system comprising:
 preparing a plurality of degasification units, a housing which houses the plurality of degasification units and has an inlet through which a liquid is supplied from outside and an outlet through which the liquid is discharged to the outside, and a suction pipe;   fixing the plurality of the degasification units to the housing with a sealing portion which partitions an internal space of the housing into an upstream side region on the inlet side and a downstream side region on the outlet side via the plurality of degasification units; and   making pressure losses of the liquid of the plurality of degasification units different depending on a distance from a central axis of the housing.   
     
     
         13 . The method for manufacturing a degasification system according to  claim 12 , further comprising:
 preparing a plurality of degasification modules each having a hollow fiber membrane bundle having a plurality of hollow fiber membranes arranged around a liquid supply path through which a liquid is supplied and a cylinder which houses the hollow fiber membrane bundle and in which discharge ports for discharging the liquid are formed, and a connection supply pipe in which a plurality of openings through which the liquid passes are formed; and   inserting the connection supply pipe into the liquid supply paths of the plurality of degasification modules to connect the liquid supply paths of the plurality of degasification modules in series by the connection supply pipe and disposing the plurality of openings at positions corresponding to the plurality of degasification modules such that the liquid is supplied to the hollow fiber membrane bundles of the plurality of degasification modules in parallel, to manufacture the degasification unit.   
     
     
         14 . A method for producing natural resources in the degasification system according to  claim 1 , comprising:
 a degasification step of degasifying a liquid by supplying the liquid from the inlet to the plurality of degasification units and depressurizing an inside of the plurality of hollow fiber membranes of each of the plurality of degasification units; and   
       a press-in step of pressing-in the liquid degasified in the degasification step into a natural resource mining site.